Question 1153396
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Let x be the actual price per motor.

Then hypothetical price would be (x-5) dollars.


The equation to find x, from the condition, is


    {{{450/(x-5)}}} - {{{450/x}}} = 1.     (1)


You can solve it using formal algebra, but the solution is clear even without it:


    x = 50 dollars.      <U>ANSWER</U>


<U>CHECK</U>.  Check validity of the equation (1):  {{{450/(50-5)}}} - {{{450/50}}} = 10-9 = 1.   ! Correct !
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